A React hook for listening to the state of a CSS media query

useMediaQuery.js

import { useEffect, useState } from 'react';

export default function useMediaQuery(query, defaultValue) {
  const [matches, setMatches] = useState(defaultValue);

  useEffect(() => {
    const mql = window.matchMedia(query);

    setMatches(mql.matches);

    mql.onchange = event => {
      setMatches(event.matches);
    };

    return () => {
      mql.onchange = null;
    };
  }, [query]);

  return matches;
}